Bild

Siemens Stiftung

Sound diffraction

Graphic:
Diffraction is a typical feature of sound waves when they meet an obstacle.

The diffraction of sound waves is a physical mechanism which ensures the entry of sound waves into acoustic shadows.
That means the sound is audible in areas which are cut off from the direct sound incidence, such as behind obstacles.

Information and ideas:
Diffraction of light can be proved when a parallel ray beam of monochrome light is directed at a narrow opening. A screen set up behind the opening gives us a diffraction figure (bright and dark stripes that lose intensity the further outwards they are). With sound, a direct reference to the students' everyday world is even easier: Why can you hear noise from a street in front of a building even when you are behind the building?
Further information about this graphic is provided as an information sheet on the media portal of the Siemens Stiftung.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves

Medientypen

Bild

Lernalter

13-18

Schlüsselwörter

Chart Optics Sound Wave (physics)

Sprachen

Englisch

Anderer Ressourcentyp

Siemens Stiftung

Optics - The physics of light

Information sheet:
Starting from the definition of light, light is described concisely in its various forms as a ray, as a wave, and as radiant energy.

Introduction to optics.

Information and ideas:
Intended as preliminary information for students as well as for teachers.

Bild

Siemens Stiftung

Lens and imaging equation

Schematic diagram:
The light rays emanating from the object must be collected through a lens to form the points of an image. The imaging equation describes the applicable laws.

At least two of the following rays are needed to construct the image:
· Ray from the object parallel to the optical axis (parallel ray)
· Ray from the object through the focal point of the lens (focal ray)
· Ray from the object through the central point of the lens (central point ray).

The central point ray passes through the lens without changing direction. The parallel ray passes through the focal point on the other side of the lens, and the focal ray becomes the parallel ray.

Note: The imaging equation is also frequently known as the "lens equation."

Information and ideas:
What are lenses needed for?

Medientypen

Bild

Lernalter

13-18

Schlüsselwörter

Light Optics

Sprachen

Englisch

Anderer Ressourcentyp

Siemens Stiftung

Symmetry - what is that?

Information sheet:
The types of symmetry, examples from everyday life, important features of symmetry, and basic technical terms on the topic are explained in simple words.

Comments on the origin of the word and also on the meaning of symmetry in the wider sense of the word (beauty, usefulness, fairness) introduce the topic. This is followed by an overview of the three types of symmetry (reflection, rotational, and translational symmetry).

Bildungsbereiche

Elementarbildung

Fach- und Sachgebiete

Mathematik

Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp, Arbeitsblatt

Siemens Stiftung

Arithmetic with a mirror

Interactive arithmetic exercise:
Five coins are arranged on a table. How must the pocket mirror be placed to double the number of coins? (And four other exercises.)

Three possible positions for the pocket mirror are given in each case. Click the button with a check mark to show the correct mirror position. At the same time, a photo showing the correct answer is displayed.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

Lens and imaging equation

Interactive schematic diagram:
The light rays emanating from the object must be collected through a lens to form the points of an image. The imaging equation describes the applicable laws.

The graphic can be labeled interactively, either individually or in full. Manual labeling on the interactive whiteboard is also possible.

Medientypen

Anderer Ressourcentyp

Lernalter

13-18

Schlüsselwörter

Light Optics

Sprachen

Englisch

Bild

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Acoustic scattering

Graphic:
Acoustic scattering. One of several ways sound waves react when they hit an obstacle.

Scattering is a reflection of small structures in no particular preferred direction. It is very much dependent on frequency.

Information and ideas:
Can be checked with the students in an experiment.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves

Bild

Siemens Stiftung

Symmetry through mirrors

Photo:
A drawing of a butterfly and the letter A are completed with respect to reflection symmetry by their mirror images.

This picture picks up the cover image of the "Symmetry" interactive whiteboard content for elementary school. It shows how an image can be completed symmetrically with respect to reflection, or duplicated, by means of reflection on an axis of symmetry.

Bildungsbereiche

Elementarbildung

Fach- und Sachgebiete

Mathematik

Medientypen

Bild

Lernalter

6-10

Schlüsselwörter

Axial symmetry Geometric figure Geometry Optics

Sprachen

Englisch

Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

Guideline for the "Symmetry" interactive whiteboard content

Guideline:
The document provides an overview of the central content and central theme of the "Symmetry" content package.

This guideline is aimed at teachers. It presents all media of the content package and gives an example of how these media can be brought into a meaningful didactic context.


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

The Ear, Hearing and Hearing Impairment;: Sound propagation and obstacles

Information sheet:
What happens when sound hits an obstacle? The wave nature of sound is explained.

Sound waves propagate concentrically or spherically. A free or undisturbed sound field is one where there are no obstacles in the path of the sound waves. In everyday life, however, the sound field is usually disturbed or blocked by obstacles, for example, walls or people.
There are a number of ways a sound can behave when it hits an obstacle: refraction, reflection, dispersion, absorption, diffraction. All these possibilities arise ultimately because of the wave nature of sound.

Information and ideas:
This information sheet provides a good overview of the most important basic concepts of the wave nature of sound.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves


Dieses Material ist Teil einer Sammlung